Physical Characterization of Bismuth Oxide Nanoparticle Based Ceramic Composite for Future Biomedical Application

Employment and the effect of eco-friendly bismuth oxide nanoparticles (BiONPs) in bio-cement were studied. The standard method was adopted to prepare BiONPs-composite. Water was adopted for dispersing BiONPs in the composite. A representative batch (2 wt. % of BiONPs) was prepared without water to study the impact of water on composite properties. For each batch, 10 samples were prepared and tested. TGA (thermogravimetric analysis) performed on composite showed 0.8 wt. % losses in samples prepared without water whereas, maximum 2 wt. % weight losses observed in the water-based composite. Presence of BiONPs resulted in a decrease in depth of curing. Three-point bending flexural strength decreased for increasing BiONPs content. Comparative study between 2 wt. % samples with and without water showed 10.40 (±0.91) MPa and 28.45 (±2.50) MPa flexural strength values, respectively, indicating a significant (p < 0.05) increase of the mechanical properties at the macroscale. Nanoindentation revealed that 2 wt. % without water composites showed significant (p < 0.05) highest nanoindentation modulus 26.4 (±1.28) GPa and hardness 0.46 (±0.013) GPa. Usage of water as dispersion media was found to be deleterious for the overall characteristics of the composite but, at the same time, the BiONPs acted as a very promising filler that can be used in this class of composites.

Manufacturing of Opals from Polymethylmethacrylate Particles in Dispersion Media with Different Viscosities

The article was prepared based on the materials of the report at the first All-Russian scientific conference with international participation "YENISEI PHOTONICS – 2020". Photonic crystals are structures that have a spatial architecture with a periodically changing complex dielectric function at scales comparable to the wavelengths of light in the visible frequency range. The purpose of this study is to obtain three-dimensional photonic crystals by self-assembly from submicron spherical monodisperse particles of polymethylmethacrylate in dispersion media with different viscosities

Improvement of Polyurea Greases Tribotechnical Properties Based on Different Dispersion Media with Different Additives

This work describes antifriction additives based on dialkyldithiophosphoric acid and molybdenum-containing friction modifiers and its influence on lubricating greases prepared with petroleum and synthetic oils tribological properties. The dependence of tribological properties of polyurea greases tribological properties on the nature, concentration of the additive (1–3 wt%) and the dispersion medium has been studied. Evaluation of antiwear and extreme pressure properties was carried out by three well-known standardized methods – FBW (four ball wear test system) and KT-2 and also using the Brugger tribometer.

Application of Biochar as a Filler of Polyurea Lubricants

The possibility of using plant-based biochar as a filler for polyurea greases was studied and its effect on their performance properties was evaluated. In the preparation of lubricants, group III petroleum oil and dioctiladipinate ester were used as dispersion media, and dimourea with a concentration of 20% was used as a thickener. It was found that lubricants containing 5-15 wt.% biochar, better reduce the diameter of the wear spot and are characterized by higher colloidal stability compared to samples that do not contain biochar. Additive to dispersion media 1 wt.% of the thickening polyisobutylene additive PIB 10 improves the performance properties of the lubricant.

Development and Standardization of Crayons with Eucalimine

Introduction. Promising sources of preparation of antiinflammatory drugs of interest for practical medicine are substances of plant origin. One of them is eucalimine, isolated from leaves or shoots of eucalyptus prutoid (Eucalyptus viminalis Labil) of the myrtle family (Myrtaceae), is a purified sum of terpenoid phenoloaldehydes of the floroglucine series (euglobals) and triterpenoids.Aim. The purpose of the present work is to create drug pencils with eucalimine for the prevention and treatment of inflammatory skin diseases.Materials and methods. The object of research is eucalymin. The study of the shape and size of ekalimine particles and its distribution in various dispersion media: cetyl alcohol, stearyl alcohol, emulsion wax, castor oil, peach oil, medical petroleum jelly was carried out.Results and discussion. The paper presents the results of experimental studies justifying the selection of adjuvants for medical pencils and their standardization.Conclusion. The composition and technology of medicinal pencils with eucalimine for external use has been developed, quality indicators have been established.